title: Ampicillin-resistant enterococcal species in an acute-care hospital.
abstract: A prospective review of all enterococcal isolates for 13 months showed that 9.0% were resistant to ampicillin (MIC, greater than or equal to 16 micrograms/ml; zone diameter, less than 15 mm), as determined by the Vitek system, disk diffusion, microdilution MIC testing, and macrodilution MIC testing. All were beta-lactamase negative. A total of 19 and 3 resistant isolates were from urine and intravascular sites, respectively. Ampicillin-resistant enterococci appear to be a growing clinical problem.
authors.affiliation: Medical Service, Veterans Administration Medical Center, Martinez, California 94553.
authors.forename: S E
authors.initials: SE
authors.lastname: Oster
authors.forename: V A
authors.initials: VA
authors.lastname: Chirurgi
authors.forename: A A
authors.initials: AA
authors.lastname: Goldberg
authors.forename: S
authors.initials: S
authors.lastname: Aiken
authors.forename: R E
authors.initials: RE
authors.lastname: McCabe
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000668:Ampicillin Resistance / Q000502:physiology*; D003428:Cross Infection / Q000382:microbiology*; D004352:Drug Resistance, Microbial; D005260:Female; D005839:Gentamicins / Q000494:pharmacology; D006801:Humans; D008297:Male; D008826:Microbial Sensitivity Tests; D008828:Microbiological Techniques; D008875:Middle Aged; D013290:Streptococcal Infections / Q000188:drug therapy; D013291:Streptococcus / Q000187:drug effects / Q000502:physiology*; D001618:beta-Lactamases / Q000096:biosynthesis
chemical_list: D005839:Gentamicins; D001618:beta-Lactamases